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Reinsurance and Retrocessional Reinsurance (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Dec. 31, 2022
Insurance [Abstract]        
Reinsurance recoverable on reserves for losses and loss adjustment expenses $ 1,164.9 $ 1,108.6 $ 1,066.3 $ 976.1
Reinsurance recoverable for paid claims and claims adjustments 194.1 182.7    
Reinsurance recoverables on paid losses, allowance 0.0 0.0    
Reinsurance recoverables on unpaid losses, allowance $ 1.3 $ 1.3